Table of Contents
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Note: the PAIS Collection Descriptor XML Schema Definition is available as part of the Data Archive Ingest XML Registry maintained by the CCSDS.
PAIS recommends that repositories establish descriptor models that define the mandatory and optional attributes needed to describe collections and transfer object types used in models of objects for transfer (MOTs) created as part of Producer-Archive Projects. This section summarizes the specifications for descriptor models provided in PAIS. For a case study on specialized descriptor models, see the Descriptor models page in the University Archives wiki.
A collection descriptor is a set of attributes that serves two primary functions:
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Collection Description. Consultative Committee on Space Data Sytems. Open Archival Information System (OAIS) recommended practice, Figure 2-2. CCSDS 650.0-M-2. |
Transfer object type descriptors
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| ISO standard | CCSDS recommendation | Description |
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| ISO 14721:2012 (OAIS) | CCSDS 650.0-M-2, Section 4.2.2.8 | The Collection Description is a subtype of the Package Description that has added structures to better handle the complex Content Information of an AIC. The Collection Description, which is modeled in figure 4-24, contains the information classes that are contained in the Unit Description. There are two types of Associated Description in a Collection Description:
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| ISO 20652:2006 (PAIMAS) | CCSDS 651.0-M-1, Section 3.1.2.1 (Preliminary phase, actions P3 through P-8) | This is the primary starting point and it is important at this stage to clearly define and delimit the information which constitutes the primary object of the Producer-Archive Project. If there are still some open options, this is the time to make these explicit. The preliminary phase cannot be completed until this has been accomplished. |
| ISO 20652:2006 (PAIMAS) | CCSDS 651.0-M-1, Section 3.2.2.1 (Formal definition phase, actions F-3 through F-12) | This subsection discusses the precise definition of the information to be transferred from the Producer to the Archive. This definition is a formal model of objects to be delivered. |
| ISO 20652:2006 (PAIMAS) | CCSDS, 651.0-M-1, Action F-7 | Choose the tools: Producer and Archive define the tools to be installed by the Producer or acquired by the Archive (to aid with data production, production of descriptors, document production, etc.). |
| ISO 20652:2006 (PAIMAS) | CCSDS, 651.0-M-1, Action F-8 | Write a description of the Information Objects: A description of the elements previously negotiated by the Archive or the Producer must create an unambiguous record of the decisions and agreements. The record should be available to both the Producer and the Archive. This description will be part of the final Submission Agreement. This description refers to the Data Dictionary and the formal model (defined in subsections 3.2.2.1.3 and 3.2.2.1.4). |
Learning resources
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The Trustworthy Digital Repository tutorial includes detailed information on PAIS collection descriptors and transfer object type descriptors. |
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| title | Case study: DalCLASS |
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| ISO 20104:2015 (PAIS) | CCSDS 651.1-B-1 |
References
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Consultative Committee on Space Data Systems. Open Archival Information System (OAIS) recommended practice, Section 4.2.2.8. CCSDS 650.0-M-2.
Consultative Committee on Space Data Sytems. Producer-Archive Interface Specification recommended standard, Section 2.2. CCSDS 651.1-B-1.
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